ELECTRICALLY CONDUCTIVE OXIDE SINTERED COMPACT, MEMBER FOR ELECTRICAL CONDUCTION, GAS SENSOR, PIEZOELECTRIC ELEMENT, AND METHOD FOR PRODUCING PIEZOELECTRIC ELEMENT

摘要

In the present invention, an electrically conductive oxide sintered compact contains a crystal phase having a perovskite type oxide crystal structure represented by the compositional formula REaCobCucNidOx (here, RE denotes a rare earth element, a+b+c+d = 1, and 1.25 ≤ x ≤ 1.75). The coefficients a, b, c and d satisfy the relationships 0.474 ≤ a ≤ 0.512, 0.050 ≤ b ≤ 0.350, 0 < c < 0.250 and 0.050 ≤ d ≤ 0.350.